How do I simplify these two algebra expressions?

E = {a^-1 [a^-2 (a^-1)^-1] ^-3}^-2

(1) a^-4

(2) a^-6

(3) a^4

(4) a^12

C= 3√ x^-3 (x^3 x^-5)^3 / ( x^5 x^-4)^-1

(1) x^-2

(2) x^-6

(3) X ^+2

(4) x ^6

thank you

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